Self-inductance device



Nov. 21, 1939. E. RElsl-:R

SELF-INDUCTANCE DEVICE.

Filed March 51, 1958 Patented Nv..21,1939 2,180,850;

` UNITED STATES 'PATENT ori-Ica SELF-INDUCTANCE DEVICE Ernst Reiser, Berlin, Germany, assignor C. Lorenz Aktiengesellschaft, Berlin-Tempelhof, Germany, a company Application March 31, 1938, Serial No. 199,145 In Germany April 3, 1937 7 Claims. (Cl. 171-119) The present invention relates to self-inductarrangement of Fig. l, while Fig. 3 is a longiance devices and particularly to arrangements ltudinal cross section through a coupling transhaving cores of high-frequency iron. y former in accordance with the invention.

'Ihe use of a sheath-formed body of high- Referring rst to Figs. 1 and 2, reference nu- 5 frequency iron-dust encompassing the winding is meral I designates an insulating body of subl a known expedient in connection with selfstantially tubular shape which serves as a supinductance coils. It is also known to provide port for a coil 2. The-desired number of turns Vthe high-frequency iron-dust core with an air are arranged on an insulating member I5 which gap of variable size for balancing the selfmay be of Bakelite or the like. The coil isplaced induction of diierent coils, so as to obtain coinon va core I4 of high-frequency iron iltted in a l0 cidence of operation. The known structures of high-frequency iron-dust base plate 3.' A tubuthis type generally employ the high-frequency lar sheath 4 of similar material surrounding the iron-dust core as the support for the adjusting coil is closed by a movable disc 5 also of similar means which may be a threaded rod of highmaterial'adapted to effect balance. The tubular frequency iron arranged to be screwed more or sheath 4 and the base plate 3 are iixed in posil5 less into the coil, but the thread which has been tion by a cover disc 6 threaded into the insulatcut in the compressed iron dust will likely be ing body I. The base plate 3 is provided with a damaged by vibrations affecting the devices with slot which is adapted to receive a nose 1 provided the result that theI value of the self-induction is integral with the body I at its lower end, so as to subjected to changes. Moreover, these known prevent angular displacement therebetween. The 20 arrangements either present very low capability cover disc 6 of insulation carries a set screw 8 of adjustment or involve considerableecapacitive likewise o'f insulating material. The balancing de-tuning on regulation. disc 5 is iixedto the lower end of said screw.

These disadvantages are obviated according to The inductance value of the coil is balanced by g5 the invention which employs a high-frequency turning the screw 8.

iron-dust magnetic structure made in several The above disclosed arrangement providosa separate parts, said parts being arranged in a reliable supporting means for all'separate memcontainer of insulating material, preferably of bers of high-frequency iron. Two longitudinal tubular shape. This container is closed by a projections 9 are formed integral with the body cover which serves not only for maintaining the I of insulation and serve Vfor fixing the selfvarious parts in position but also as support for inductance coil. A further circumferential exa balancing disc. Induction changes up to 20 tension I0 likewise integral with the body I is per cent may be obtained by this arrangement adapted to receive the soldering tabs II clamped by suitably chosen cross sectional areas of the thereto. l

iron and an adequate stroke of the balancing disc. Fig. 3 lillustrates a transformer arrangement The container of insulation may according to similar to the above described self-inductance a further feature of the invention also serve as coil arrangement, the individual elements of support for a second coil through which a small which carry the same designations as those shown part only of the lines of force of the coil with in Figs. 1 and 2. However, the base portion of o iron core ows. This arrangement constitutes the insulating body l has in this arrangement' a high frequency transformer which permits a been replaced by a at frame or `body I2 carrying low degree of coupling. The turns of this coil a second winding I3. In order to avoid capacimay be located in the lower part of the insulating tive de-tuning` of the coupling coil I3, which may bOdy external t0 the high-frequency magnetic be set up when the coil is placed on metal for Sheath Surrounding the main coil. This arrangeexample, a further iron disc 3' is located below s ment is particularly advantageous since the secthis coil. This arrangement involves the adond coil comprises for a given small degree of vantage that the same elements may be utilized coupling a relative large number of turns which as in connection with `the simple self-induction i provide' suitable balancing properties. device according to the Figs. l and 2 and, more- The invention will be fully understood from over, the frequently desired requirement of a low o the following description taken inl conjunction degree of coupling may be secured thereby. with the accompanying drawing, in which: The insulating container and its projections Fig. 1 represents a longitudinal cross section l are preferably Produced in one manufacturing through a self-inductance device according'to operation.

the invention, Fig. 2 shows a top view of the What is claimed is: u

1. .A self-inductance device as dened in claim 6, in which said casing element carries a circumferential extension formed integral therewith 'and a plurality of soldering tabs clamped to said extension.

2. A coupling transformer comprising a magnetic structure of high-frequency magnetic dust including a base plate. a centre core xed perpendicularly to said base plate and a tubular sheath extending perpendicularto said base plate around said core, a container of insulation surrounding said magnetic structure, a cover screwed into the upper end of said container,

said'cover and container being shaped and po sheath of compressed magnetic dust substantially coaxially surrounding said winding and extending to said base element at one end and beyond the end of said winding at its other end, a casing element of insulating material around said sheathshaped to rmly engage both said base element and said sheath to hold them in xed relation to each other and to said casing element, a core of compressed magnetic dust sup ported inside said winding, and a disc-like ading remote from said base element and supported solely from said casing element adjustably for movement within said sheath.

alsdann justing member disposed at the end of the wind- 4. An inductance device according to claim 3. wherein said core is xed to said base member independent of said casing element and said disc-like adjusting member.

5. .An inductance device according to claim 3, wherein said casing element and said base, element are formed with projections on one of said elements and corresponding recesses on the other of said elements shaped to fix said two elements against relative rotary movement.

6. A high frequency adjustable inductance deE vice which comprises a winding, a plate-like base element of compressed magnetic dust disposed transversely at one end of said winding and extending beyond the circumference of saidv winding, a separate tubular sheath of compressed magnetic dust substantially coaxially surrounding said winding andextending to said base element at one end and beyond the end of said winding at its other end, a two-part casing element of insulating material around said sheath including a body member and'a cover member threaded thereto, said combined element being shaped to clampingly engage both said base element and said sheath to hold them in fixed relation to each other and to said casing element, a core of compressed magnetic dust supported inside said winding, and a disc-like adjusting member disposed at theA end of the core remote from said base element ,and supported solely from said casing element adjust;- abl'y iormovement within said sheath.

7. An inductance device according to claim 6, wherein said core-is nxed to said base element and which'further comprises a screw of insulating material threaded through said casing element and i'ixled to said disc-like member for adjustably supporting said member for axial movement toward or away from said winding and core.

. ERNST REISER. 

